This is the eleventh edition of CSA B137.4, Polyethylene (PE) piping systems for gas services. It supersedes the previous editions published in 2017, 2013, 2009, 2005, 2002, 1999, 1992, 1986, 1977, and 1971.
While earlier editions of this Standard were published as part of the CSA B137 Series, Thermoplastic pressure piping compendium, the tenth edition was reissued as a stand-alone Standard in January 2019. The compendium format has been discontinued.
This Standard is to be used with the 2020 edition of CSA B137.0, which provides requirements and test methods that are common to some or all of the Standards of the CSA B137 series.
The major changes in this new edition are the following:
a) addition of Clause 18.104.22.168 and Table 10 for elevated temperature service;
b) addition of Clause 22.214.171.124 to restrict rework material in mechanical or fused fittings;
c) revision to Clause 126.96.36.199 on the sustained pressure test requirements for different compounds;
d) additional pipe marking requirement to Clause 7.1.1; and
e) addition of Clause 7.3 for tracking and traceability.
This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.
This Standard covers polyethylene (PE) pipe, tubing, and fittings for use in gas mains and services, including gathering, transmission, and distribution of fuel gases containing not more than 1% aromatic hydrocarbons.
This Standard covers all types of fittings and connections used in plastic gas pipe systems, including
a) plastic-to-metal transition fittings;
b) plastic component fittings (e.g., elbows, tees, end caps, and valves); and
c) clamps and couplings.
1) In this Standard, pipe refers to pipe having IPS outside diameters and tubing refers to pipe having copper tube size outside diameters.
2) In this Standard, test requirements for pipe apply to both pipe and tubing.
This Standard specifies the manufacturing and testing requirements necessary to ensure that the PE compound, pipe, and fittings are of a quality acceptable for use in gas distribution systems. This Standard specifies requirements for
a) primary properties of the compound;
b) physical properties of the finished product;
c) on-line monitoring during production;
d) shipping and storage; and
Note: The user of the pipe, tubing, or fittings should refer to CSA Z662 for design and installation limitations of products covered by this Standard.
In this Standard, shall is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; should is used to express a recommendation or that which is advised but not required; and may is used to express an option or that which is permissible within the limits of the Standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.